You're comparing two Spring Hill homes a mile apart, one in Maury County and one in Williamson County. Whose property tax history tells you what you'll actually pay? For anyone writing an offer this fall, the timing matters. Under Tennessee's statewide schedule, current-year property taxes become due the first Monday in October, which was October 5 this year. They become delinquent on March 1. So the 2026 bills already exist. On the Maury side, the 2026 bill can look quite different from the 2025 bill a seller might hand over.

The city's tax rate is the same as last year. What changed is which county reappraised, and in Spring Hill that has switched sides two years in a row.

The $86 Gap Everyone Quotes

Compare the two sides by rate alone and the county line looks almost irrelevant. For fiscal year 2026-27, the rates per $100 of assessed value are:

• Maury County: $1.369, a certified, revenue-neutral rate that is 28 percent lower than the old $1.91
• Williamson County: $1.30, adopted by the county commission on June 18, 2026
• City of Spring Hill: $0.739, the same on both sides of the line

Tennessee assesses residential property at 25 percent of appraised value. A home appraised at $500,000 is therefore assessed at $125,000. At these rates, the combined county and city bill would be about $2,635 on the Maury side and $2,548.75 on the Williamson side. That's an $86.25 difference before exemptions or other charges.

This comparison treats taxes as a snapshot. In Spring Hill they move year to year, and the movement comes from the appraisals, not the rates.

Two Counties Reappraise in Different Years

Williamson County reappraised in 2025. When the assessor gave the county commission an update that May, the Williamson Herald reported that countywide property values had risen "around 52% since the last reappraisal four years ago." At the same meeting the commission moved from a four-year reappraisal cycle to a three-year cycle, according to Citizen Portal. Counting three years from 2025 points to 2028 for the next one.

Maury County reappraised in 2026. Maury County Property Assessor Bobby Daniels said in a Main Street Maury interview, as read on Front Porch Radio, that the total assessed value of all property in the county rose 43.17 percent from 2025 to 2026. Its two previous reappraisals were four years apart. A 2022 Columbia Daily Herald report compared that year's values with the reappraisal "four years ago," which was 2018.

After a reappraisal, state law requires a reset. Daniels explained in the same interview that the state issues certified tax rates designed to bring in about the same revenue from existing property as the year before. Under that rule, a governing body that wants to exceed the certified rate must advertise its intent and hold a public hearing. He described the principle this way:

"The county and municipalities can't benefit off the value change during a reappraisal… If property values started declining, the offset would be a higher tax rate."

Spring Hill gets one of these resets whenever either county reappraises. In the past two budget cycles, the city declined to adopt the certified rate both times.

One Rate, Held Two Years Running

In May 2025 the Board of Mayor and Aldermen acknowledged the certified rates in Resolution 25-129. At that meeting, the city's finance director said keeping the current rate would raise property tax bills on the Williamson County side because reassessed values had gone up, Citizen Portal reported. A year later the rate was still $0.739. The 2026 staff memo calls it "consistent with the City's current property tax rate."

In 2026 the board did the same thing for the other county. Ordinance 26-09 is titled as adopting a rate "which exceeds the certified tax rate." It lists the Maury and Williamson portions separately and sets both at $0.739. The city's June 15, 2026 announcement tied the vote to Maury County's countywide reassessment. It said the rate would bring in an additional $1.95 million for new police and fire positions, a new fire truck and city facility projects. The finance director's memo used a different baseline. It compared the rate with the certified rate and put the gap at about $3.1 million.

On paper the rate is uniform. Its effect lands mostly on whichever side had just been reappraised. In 2026, $0.739 is about 14 percent above the certified $0.6476. In 2025 it was about 38 percent above the Williamson portion's certified $0.5353.

What That Looks Like on a Maury-Side Bill This Year

Daniels gave Maury owners a simple test for the county portion of their bill. If your appraisal rose by more than the countywide 43.17 percent, expect a higher county bill than last year. If it rose by 43.17 percent or less, expect a lower one. That test works because the county adopted its revenue-neutral rate.

The city portion works differently. Here is how it plays out for a Maury-side Spring Hill home whose appraisal rose exactly in line with the county:

1. The county portion stays about level. The value went up 43.17 percent, and the county rate fell 28 percent to offset it.
2. The city portion rises 43.17 percent. The assessed value went up by that much, and the city rate stayed at $0.739.
3. Measured against the certified rate, the city line on a $500,000 appraisal is $923.75, compared with $809.50 at $0.6476. That works out to $114.25 a year.

A Williamson-side home in the same subdivision went through this a year earlier. It wasn't reappraised in 2026, so its city line had nothing to reset. The 43.17 percent figure is a countywide total, not a residential median. Individual Spring Hill homes may have risen faster or slower than that.

Why a Seller's Last Bill Can Mislead

During a purchase, this mostly shows up in the numbers a buyer uses to estimate monthly costs. A 2025 bill on the Maury side was calculated on pre-reappraisal values. It describes a tax year that's already over. On the Williamson side, the 2025 bill already reflects that county's reappraisal. Two houses with similar tax histories can be at very different points in their reset cycles.

Before you compare carrying costs across the county line, it helps to ask a few things:

• Which county is the parcel in, and when did that county last reappraise? For Williamson it was 2025, and for Maury it was 2026.
• Is the seller's most recent bill for 2026? Those bills became due in October under the state schedule.
• When is the next reset? Williamson's three-year cycle points to 2028. Maury's last three reappraisals have been four years apart.

Owners who think a reappraised value is too high do have a process. In Maury County, Daniels described it as an informal review by the assessor's office first, then an appeal to the Maury County Board of Equalization, which convened June 1. The Tennessee Comptroller notes that session lengths and appeal deadlines vary by county, and that owners should confirm them with their county assessor.

Quick Answers

Does Spring Hill charge a different city rate in each county?

No. Ordinance 26-09 sets $0.739 per $100 of assessed value for both the Maury and Williamson portions for July 1, 2026 through June 30, 2027.

Are there other charges that differ across the line?

Yes, the county wheel tax, which is a vehicle charge and not a real estate tax. The County Technical Assistance Service lists it at $25 in Maury County and $25.75 in Williamson County for 2026.

Will the Williamson side face this again?

Williamson's move to a three-year cycle after its 2025 reappraisal points to 2028. The city will get a new certified rate then and will have to decide again whether to adopt it.

This post is general information about how local tax rates and reappraisals work, not tax, legal or financial advice. Please confirm the details for any specific property with the county assessor, the trustee or a qualified tax professional.

If you're comparing homes on both sides of Spring Hill's county line, Sarah Nicodemus can go through each parcel's 2026 tax bill and reappraisal timing with you before you make an offer. Book a free consultation and we'll start with the addresses on your list.